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Health Hazard Evaluations (HHEs)

Each month we will update this page to highlight newly released final reports and information on new and emerging hazards we are evaluating. Check back often to see what we are up to!

What's New

  • Noise Recommendations Provided to a Gray and Ductile Foundry
    Finding that employees we monitored had noise exposures greater than noise exposure limits, and most noise exposures were greater than 100 decibels, A-weighted, HHE Program investigators recommended improving acoustic barriers and treatments, maintaining equipment to eliminate rattling from loose parts, and ensuring employees wear their hearing protection properly. To read the full report go to
  • Evaluation of Noise Exposures During Total Knee Replacement Surgeries
    HHE Program investigators found one surgeon’s noise exposure exceeded the NIOSH REL, but all other surgical staff were below noise exposure limits. We estimated that surgeons could be overexposed to noise depending on the noise level during surgeries and length and number of surgeries in a work shift. We recommended including orthopedic surgeons in a hearing loss prevention program, using quieter surgical tools, and providing hearing protection. To read the full report go to
  • 2016 Health Hazard Evaluation Program Annual Report
    The NIOSH Health Hazard Evaluation (HHE) Program is pleased to share the 2016 annual report. The report includes summaries of interesting projects and other highlights of our year. We hope the report stimulates conversations about who the HHE Program is and how we make a difference for the health and safety of employees throughout the United States. A link to the annual report is available here:
  • New HHE Video Series Shows What Happens on a Site Visit
    Ever wonder what happens when the Health Hazard Evaluation team visits a workplace? Watch 3 new HHE videos to get a glimpse into our activities. Each video shows a different type of testing or sampling conducted in a workplace and reactions from the employer and employees.